X a aluminum



. UNITED sra'ras PATENT OFFICE ARCHIBALD O. MASON, OF CHICAGO, ILLINOIS.

ALUMINUM ALLOY,

i No Drawing,

' T all whom it may concern Be it known that I, ARCHIBALD O. MAsoN, a citizen of the United States of America, and a resident of Chicago,.county of Cook,

and State of Illinois, have invented certain new and useful Improvements in Aluminum Alloys, of which cation. p

The main objects of this invention are to provide an improved alumiiiiim alloy obtained by the addition ofa comparatively small quantity of other metals which, Withoiftimpairing the strength and lightness of the product, impart to it other qualities 16 Whlffl} make it superior to other aluminum alloys for general use in the formation of castings and to provide. an improved compound of aluminum, copper, and zinc which is peculiarly suitable for making castings 20 and at the same time more ductile and more easily machined than the aluminum alloys which have been heretofore commonly used. Aluminum has recently come into great --demand*for'castings Where strength combined with low weight 1sdesired. The most extensive use of aluminum, at the present time is for the castings for automobile and aeroplane motors, Where great strength is required, but Where lightness and compactness are also very essential. p

Heretoforethere has been and still is being marketedan aluminum alloy ,for this purpose which has come to be known in the trade as standard. This alloy generally comprises 92 per cent. aluminum and 8 per Specification of Letters Patent.

the following is a {specifiper cent. aluminum, 6%

It is the purpose of the present invention to provide analuminum alloy which possesses substantially all of the valuable characteristics of the standard aluminum With regard to strength and lightness, but which overcomes the aforesaid objectionable characteristics. To that end, the present alloy 1 involves reducing the amount of copper as Patented June 3, 191 9.

Application filed July 1, 1918. Serial No. 242,838

tially 91. per cent. aluminum, 6% per cent..-

copper, and 2' per cent. zinc. I

The reduction in the amount of copper tends to increase the ductility of the alloy, and the addition of the zinc tends to make the machining thereof much easier, and the result of said machining is a much smoother and more finished surface than is the case with the standard alloy. The product is capable of use for castings to the same extent that said standard alloy has been found 'u'a'ctical and because of these additional advantages, is much more suitable for many purposes.

. I claim:

1. An alloy of aluminum, copper, and zinc, substantially in the proportions of 914,- per cent copper,-and 2 per cent. zinc. r l

2. An alloy of about 9111- per cent; of aluminum, about 6%; per cent. of copper, and

a small L part of zinc sufficient to adapt it for' good mach1n1ng,the zinc content ranging from 1 to 2 per cent.

Chicago this 26th'day of June,

Signed at aaonmann o. MASON.- 

